Furnace-charging mechanism



\Now 23 1926.

H. SCHAFFERT FURNACE CHARGING MECHANISM 'Filed June 1. 1925 Fig.1

Patented Nov. 23, 1926. p Y

UNITED STATES PATENT OFFICE.

HUBER/T SCHAFFER'I, F HALLEONTHE-SAALE, GERMANY.

FURNACE-CHARGING MECHANISM.

Application filed June 1, 1925, Serial No. 34,150, and in Germany February 28, 1926.

This invention relates to charging devices relatively to one another that one aperture for roasting, heating, hardening or cementais always sealed gas-tight by the walls of tion drums. the chamber 2 when the other is in the open In the known devices described in Gerposition and vice versa.

5 man Patent No. 391,547, there is closely Thus when the interior of the rotatable fitted on to one end of the heating drum, valve has been filled with the desired quanbuilt in and rotating in the hardening furtity of charge, the drum 1 can be turned nace, a charging funnel and on the other end through 90 by means of the hand-lever 4: a quenching chamber, whereby the discharge aperture 7 is brought It is of great importance that the closure, into position over the delivery tube 8 whilst especially of the charging device, is absoat the same time the chamber wall 2 of the lutely gas-tight as otherwise noxious gas inlet guide is sealed gas-tight.

can escape from the drum and also the proc- In order to ensure a uniform charging, ess ltself 1s adversely affected. the driving wheel 0 of the roasting harden- According to the present invention, a ing or cementation drum Z) is furnished with charging device is used which renders posa projection 9 which turns the rotatable sible uniform and intermittent charging slide-valve 1 into the discharge position on of the heating drum through an absolutely each rotation of the drum and immediately gas-tight closure, which has hitherto not releases it whereon the valve is returned to been achieved in the known charging deits original position by means of a spring vices wherein each time the closing valve 10 suitably located. In this way it is enwas opened for filling, gas could naturally sured that the charge is supplied to the escape or enter. The charging device aedrum at uniform intervals and always when, cording to the invention is clearly illustratin the charging position, a complete thread ed in the accompanying drawings in which, of the conveying screw has just become free.

Fig. 1 is a view in longitudinal section of I claim: the entire device; 1 In apparatus of the class described a ro- Fig. 2 is a transverse sectional view of the tatable drum, charging means for the drum charging device taken on the line 22 of including a hollow cylindrical valve pro- Fig. 1, and vided with spaced inlet and discharge open- Fig. 3 is a transverse sectional view of ings, and a casing for said valve including the operating means for the charging dean inlet guide, said valve having a radial vice taken on the line 3-3 of Fig. 1 lookarm and said drum being provided with a ing in the direction of the arrows. tappet member to engage said arm and The charging device consists essentially thereby cause said drum at each rotation of a valve 1 which is mounted rotatably in thereof to partly turn said valve, and a the chamber 2 of the inlet guide 5 on the spring to return said valve to normal posishaft 3 and which works similarly to the tion. ordinary bucket wheel charging devices. It In testimony whereof I have afiixed my is provided with a filling aperture 6 and a signature. discharge aperture which are so arranged HUBERT SCI-IAFFEBT. 

